/Engine/Source/Editor/AnimationBlueprintLibrary/Public/AnimationBlueprintLibrary.h
Adds an instance of the specified MetaData Class to the given Animation Asset (requires MetaDataObject's outer to be the Animation Asset)
static void AddMetaDataObject ( [UAnimationAsset](API\Runtime\Engine\Animation\UAnimationAsset) * AnimationAsset, [UAnimMetaData](API\Runtime\Engine\Animation\UAnimMetaData) * MetaDataObject )